# This file is part of MyPaint.
# Copyright (C) 2012-2013 by Andrew Chadwick <a.t.chadwickgmail.com>
# Copyright (C) 2014-2015 by the MyPaint Development Team.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.


"""Axis-aligned planar slice of an HSV color cube, and a depth slider.
"""

from __future__ import division, print_function

from gettext import gettext as _

from gi.repository import Gtk

from util import *
from lib.color import *
from adjbases import ColorAdjusterWidget
from adjbases import ColorAdjuster
from adjbases import SliderColorAdjuster
from adjbases import IconRenderableColorAdjusterWidget
from combined import CombinedAdjusterPage
from uimisc import *


class HSVCubePage (CombinedAdjusterPage):
    """Slice+depth view through an HSV cube: page for `CombinedAdjuster`.

    The page includes a button for tumbling the cube, i.e. changing which of
    the color components the slice and the depth slider refer to.

    """

    # Tooltip mappings, indexed by whatever the slider currently represents
    _slider_tooltip_map = dict(h=_("HSV Hue"),
                               s=_("HSV Saturation"),
                               v=_("HSV Value"))
    _slice_tooltip_map = dict(h=_("HSV Saturation and Value"),
                              s=_("HSV Hue and Value"),
                              v=_("HSV Hue and Saturation"))

    def __init__(self):
        self._faces = ['h', 's', 'v']

        button = borderless_button(
            stock_id=Gtk.STOCK_REFRESH,
            size=Gtk.IconSize.MENU,
            tooltip=_("Rotate cube (show different axes)")
        )
        button.connect("clicked", lambda *a: self.tumble())
        self.__slice = HSVCubeSlice(self)
        self.__slider = HSVCubeSlider(self)
        s_align = Gtk.Alignment(xalign=0.5, yalign=0, xscale=0, yscale=1)
        s_align.add(self.__slider)

        table = Gtk.Table(rows=2, columns=2)

        xopts = Gtk.AttachOptions.FILL | Gtk.AttachOptions.EXPAND
        yopts = Gtk.AttachOptions.FILL | Gtk.AttachOptions.EXPAND

        table.attach(s_align, 0, 1, 0, 1, Gtk.AttachOptions.FILL, yopts, 3, 3)
        table.attach(
            button, 0, 1, 1, 2,
            Gtk.AttachOptions.FILL, Gtk.AttachOptions.FILL, 3, 3)
        table.attach(self.__slice, 1, 2, 0, 2, xopts, yopts, 3, 3)
        self.__table = table
        self._update_tooltips()

    @classmethod
    def get_page_icon_name(self):
        return 'mypaint-tool-hsvcube'

    @classmethod
    def get_page_title(self):
        return _('HSV Cube')

    @classmethod
    def get_page_description(self):
        return _("An HSV cube which can be rotated to show different "
                 "planar slices.")

    def get_page_widget(self):
        return self.__table

    def tumble(self):
        f0 = self._faces.pop(0)
        self._faces.append(f0)
        self.__slider.queue_draw()
        self.__slice.queue_draw()
        self._update_tooltips()

    def _update_tooltips(self):
        f0 = self._faces[0]
        self.__slice.set_tooltip_text(self._slice_tooltip_map[f0])
        self.__slider.set_tooltip_text(self._slider_tooltip_map[f0])

    def set_color_manager(self, manager):
        ColorAdjuster.set_color_manager(self, manager)
        self.__slider.set_color_manager(manager)
        self.__slice.set_color_manager(manager)


class HSVCubeSlider (SliderColorAdjuster):
    """Depth of the planar slice of a cube.
    """

    vertical = True
    samples = 4

    def __init__(self, cube):
        SliderColorAdjuster.__init__(self)
        self.__cube = cube

    def get_background_validity(self):
        col = HSVColor(color=self.get_managed_color())
        f0, f1, f2 = self.__cube._faces
        return f0, getattr(col, f1), getattr(col, f2)

    def get_color_for_bar_amount(self, amt):
        col = HSVColor(color=self.get_managed_color())
        f0 = self.__cube._faces[0]
        setattr(col, f0, amt)
        return col

    def get_bar_amount_for_color(self, col):
        f0 = self.__cube._faces[0]
        amt = getattr(col, f0)
        return amt


class HSVCubeSlice (IconRenderableColorAdjusterWidget):
    """Planar slice through an HSV cube.
    """

    def __init__(self, cube):
        ColorAdjusterWidget.__init__(self)
        w = PRIMARY_ADJUSTERS_MIN_WIDTH
        h = PRIMARY_ADJUSTERS_MIN_HEIGHT
        self.set_size_request(w, h)
        self.__cube = cube

    def __get_faces(self):
        f1 = self.__cube._faces[1]
        f2 = self.__cube._faces[2]
        if f2 == 'h':
            f1, f2 = f2, f1
        return f1, f2

    def render_background_cb(self, cr, wd, ht, icon_border=None):
        col = HSVColor(color=self.get_managed_color())
        b = icon_border
        if b is None:
            b = self.BORDER_WIDTH
        eff_wd = int(wd - 2*b)
        eff_ht = int(ht - 2*b)
        f1, f2 = self.__get_faces()

        step = max(1, int(eff_wd // 128))

        rect_x, rect_y = int(b)+0.5, int(b)+0.5
        rect_w, rect_h = int(eff_wd)-1, int(eff_ht)-1

        # Paint the central area offscreen
        cr.push_group()
        for x in xrange(0, eff_wd, step):
            amt = x / eff_wd
            setattr(col, f1, amt)
            setattr(col, f2, 1.0)
            lg = cairo.LinearGradient(b+x, b, b+x, b+eff_ht)
            lg.add_color_stop_rgb(*([0.0] + list(col.get_rgb())))
            setattr(col, f2, 0.0)
            lg.add_color_stop_rgb(*([1.0] + list(col.get_rgb())))
            cr.rectangle(b+x, b, step, eff_ht)
            cr.set_source(lg)
            cr.fill()
        slice_patt = cr.pop_group()

        # Tango-like outline
        cr.set_line_join(cairo.LINE_JOIN_ROUND)
        cr.rectangle(rect_x, rect_y, rect_w, rect_h)
        cr.set_line_width(self.OUTLINE_WIDTH)
        cr.set_source_rgba(*self.OUTLINE_RGBA)
        cr.stroke()

        # The main area
        cr.set_source(slice_patt)
        cr.paint()

        # Tango-like highlight over the top
        cr.rectangle(rect_x, rect_y, rect_w, rect_h)
        cr.set_line_width(self.EDGE_HIGHLIGHT_WIDTH)
        cr.set_source_rgba(*self.EDGE_HIGHLIGHT_RGBA)
        cr.stroke()

    def get_background_validity(self):
        col = HSVColor(color=self.get_managed_color())
        f0 = self.__cube._faces[0]
        return f0, getattr(col, f0)

    def get_color_at_position(self, x, y):
        alloc = self.get_allocation()
        b = self.BORDER_WIDTH
        wd = alloc.width
        ht = alloc.height
        eff_wd = wd - 2*b
        eff_ht = ht - 2*b
        f1_amt = clamp((x-b) / eff_wd, 0, 1)
        f2_amt = clamp((y-b) / eff_ht, 0, 1)
        col = HSVColor(color=self.get_managed_color())
        f1, f2 = self.__get_faces()
        f2_amt = 1.0 - f2_amt
        setattr(col, f1, f1_amt)
        setattr(col, f2, f2_amt)
        return col

    def get_position_for_color(self, col):
        col = HSVColor(color=col)
        f1, f2 = self.__get_faces()
        f1_amt = getattr(col, f1)
        f2_amt = getattr(col, f2)
        f2_amt = 1.0 - f2_amt
        alloc = self.get_allocation()
        b = self.BORDER_WIDTH
        wd = alloc.width
        ht = alloc.height
        eff_wd = wd - 2*b
        eff_ht = ht - 2*b
        x = b + f1_amt*eff_wd
        y = b + f2_amt*eff_ht
        return x, y

    def paint_foreground_cb(self, cr, wd, ht):
        x, y = self.get_position_for_color(self.get_managed_color())
        draw_marker_circle(cr, x, y)


if __name__ == '__main__':
    import os
    import sys
    from adjbases import ColorManager
    mgr = ColorManager(prefs={}, datapath='.')
    cube = HSVCubePage()
    cube.set_color_manager(mgr)
    mgr.set_color(RGBColor(0.3, 0.6, 0.7))
    if len(sys.argv) > 1:
        slice = HSVCubeSlice(cube)
        slice.set_color_manager(mgr)
        icon_name = cube.get_page_icon_name()
        for dir_name in sys.argv[1:]:
            slice.save_icon_tree(dir_name, icon_name)
    else:
        # Interactive test
        window = Gtk.Window()
        window.add(cube.get_page_widget())
        window.set_title(os.path.basename(sys.argv[0]))
        window.connect("destroy", lambda *a: Gtk.main_quit())
        window.show_all()
        Gtk.main()
